package orm;

import java.util.List;
import java.util.Set;
import org.hibernate.LockMode;
import org.hibernate.Query;
import org.hibernate.criterion.Example;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A data access object (DAO) providing persistence and search support for Item
 * entities. Transaction control of the save(), update() and delete() operations
 * can directly support Spring container-managed transactions or they can be
 * augmented to handle user-managed Spring transactions. Each of these methods
 * provides additional information for how to configure it for the desired type
 * of transaction control.
 * 
 * @see orm.Item
 * @author MyEclipse Persistence Tools
 */

public class ItemDAO extends BaseHibernateDAO {
	private static final Logger log = LoggerFactory.getLogger(ItemDAO.class);
	// property constants
	public static final String ITEM_NAME = "itemName";
	public static final String PRICE = "price";
	public static final String DESCRIPTION = "description";
	public static final String PICTURE_PATH = "picturePath";
	public static final String STOCK_AMOUNT = "stockAmount";
	
	private static ItemDAO itemDAO = new ItemDAO();
	
	private ItemDAO() {
		
	}
	
	public static ItemDAO getInstance() {
		return itemDAO;
	}

	public void save(Item transientInstance) {
		log.debug("saving Item instance");
		try {
			getSession().save(transientInstance);
			log.debug("save successful");
		} catch (RuntimeException re) {
			log.error("save failed", re);
			throw re;
		}
	}

	public void delete(Item persistentInstance) {
		log.debug("deleting Item instance");
		try {
			getSession().delete(persistentInstance);
			log.debug("delete successful");
		} catch (RuntimeException re) {
			log.error("delete failed", re);
			throw re;
		}
	}

	public Item findById(java.lang.Integer id) {
		log.debug("getting Item instance with id: " + id);
		try {
			Item instance = (Item) getSession().get("orm.Item", id);
			return instance;
		} catch (RuntimeException re) {
			log.error("get failed", re);
			throw re;
		}
	}

	public List findByExample(Item instance) {
		log.debug("finding Item instance by example");
		try {
			List results = getSession().createCriteria("orm.Item")
					.add(Example.create(instance)).list();
			log.debug("find by example successful, result size: "
					+ results.size());
			return results;
		} catch (RuntimeException re) {
			log.error("find by example failed", re);
			throw re;
		}
	}

	public List findByProperty(String propertyName, Object value) {
		log.debug("finding Item instance with property: " + propertyName
				+ ", value: " + value);
		try {
			String queryString = "from Item as model where model."
					+ propertyName + "= ?";
			Query queryObject = getSession().createQuery(queryString);
			queryObject.setParameter(0, value);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find by property name failed", re);
			throw re;
		}
	}

	public List findByItemName(Object itemName) {
		return findByProperty(ITEM_NAME, itemName);
	}

	public List findByPrice(Object price) {
		return findByProperty(PRICE, price);
	}

	public List findByDescription(Object description) {
		return findByProperty(DESCRIPTION, description);
	}

	public List findByPicturePath(Object picturePath) {
		return findByProperty(PICTURE_PATH, picturePath);
	}

	public List findByStockAmount(Object stockAmount) {
		return findByProperty(STOCK_AMOUNT, stockAmount);
	}

	public List findAll() {
		log.debug("finding all Item instances");
		try {
			String queryString = "from Item";
			Query queryObject = getSession().createQuery(queryString);
			return queryObject.list();
		} catch (RuntimeException re) {
			log.error("find all failed", re);
			throw re;
		}
	}

	public Item merge(Item detachedInstance) {
		log.debug("merging Item instance");
		try {
			Item result = (Item) getSession().merge(detachedInstance);
			log.debug("merge successful");
			return result;
		} catch (RuntimeException re) {
			log.error("merge failed", re);
			throw re;
		}
	}

	public void attachDirty(Item instance) {
		log.debug("attaching dirty Item instance");
		try {
			getSession().saveOrUpdate(instance);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}

	public void attachClean(Item instance) {
		log.debug("attaching clean Item instance");
		try {
			getSession().lock(instance, LockMode.NONE);
			log.debug("attach successful");
		} catch (RuntimeException re) {
			log.error("attach failed", re);
			throw re;
		}
	}
}